Circulatory System - Blood Vessels Flashcards
Organisation (18 cards)
What are the three different types of blood vessels?
Arteries, Capillaries, Veins
What is the primary function of arteries?
Carry blood away from the heart
What are capillaries involved in?
Exchange of materials at the tissues
What is the function of veins?
Carry blood to the heart
How does the heart affect blood pressure in arteries?
The heart pumps blood out at high pressure
What structural characteristic allows arteries to withstand high pressure?
Thick walls and elastic fibres
What is the lumen of an artery?
The hole down the middle of the artery
What is the thickness of capillary walls?
One cell thick
What is the significance of capillaries being tiny?
They carry blood close to every cell for substance exchange
What do capillaries supply and remove?
- Supply food and oxygen
- Remove waste like CO2
What helps increase the rate of diffusion in capillaries?
Thin walls (one cell thick)
How do veins differ from arteries in terms of pressure?
Blood is at lower pressure in veins
What is the lumen size comparison between veins and arteries?
Veins have a larger lumen than arteries
What feature do veins have to assist blood flow?
Valves
How is the rate of blood flow calculated?
Volume of blood / number of minutes
Fill in the blank: The formula for calculating blood flow rate is _______.
Volume of blood / number of minutes
What was the example volume of blood and time given for calculation?
1464 ml of blood in 4.5 minutes
What is the calculated rate of blood flow from the example?
325 ml/min
